Setting device for the entry section of tensioning or tentering and drying machines for webs



F. TANDEL SETTING DEVICE FOR THE ENTRY SECTION OF TENSIONING 0R TENTERING AND DRYING MACHI FOR S Filed April 9, 195 Sheets-Sheet 1 Fly. 2

,Zkrekibfi A g- 3 F. TANDEl. 0 2,088,984

. SETTING DEVICE FOR THE ENTRY SECTION OF TENSIONING OR TENTERING AND DRYING MACHINES FOR WEBS Filed April 9, 1936 4 Sheets-Sheet 2 19:9. 2 fig 3 w /JI 3 a n {1L2 -x-J 9' L Z1 F. TANDEL 2,088,984 SETTING DEVICE FOR THE ENTRY SECTION OF TENSIONING NG AND DRYING MACHINES FOR WEBS Filed April 9, 1936 4 Sheets-Sheet 3 OR TENTERI o y w Aug. 3, 1937. TANDEL 2,088,984

SETTING DEVICE FOR THE ENTRY SECTION OF TENSIONING OR TENTERING AND DRYING MACHINES FOR WEBS Filed April 9, 1936 4 Sheets-Sheet 4 Patented Aug. 3," 1937 ammo I STATES SETTING DEVICE FOR THE ENTRY SECTION OF TENSIONING R TENTERING AND DRYING MACHINES FOR WEBS Fritz Tandel, Chemnitz, Germany, assignor to C. G. Hanbold Aktiengesellschaft, Chemnitz, Germany, a joint-stock company of Germany Application April 9, 1936, Serial No. 78,554 Germany April 15, 1935 3 Claims. (oi. 26-57) My invention relates to improvements in set ting devices for the entry section of tepsioning or tentering and drying machines for webs, and

more particularly in machines of the type in 5 which the entry section comprises side walls which are adapted to be set angularly in transverse direction forcontrolllng the movement of the web.

, In machines of this character there is an entry section in which the web is brought into engagement with the conveying means, which commonly consists of chains carrying pins or clips for engaging the edges of the web. For guiding the -said chains there are provided side walls, com.- l5 monly called .chain walls, spaced apart according to the width of the goods under treatment. The chains, guided by the chain walls, serve to spread the goods, that is, the chain walls are spaced further apart at their rearward'ends than at their m forward ends, and are joined at their rearward ends by hinges to the walls of the succeeding section. As has already been stated the web is engaged by the chains in-the entry section of the machine. The web does not run entirely uni- 5 formly, but deviates now to the left and now to the right, and it may happen, therefore, that the clips or pins carried by one chain or the other will either not fully grip the web or will grip it too far from the lateral edge. Consequently in go the case of all these machines there is an arrangement which will permit the chain walls of the entry section, and therewith alsothe chains,-

to follow the web, so to speak, so that as far as possible the web, whether it runs to the left or 35 tothe right, will always be uniformly seized on both sides by the means carried by the chains,

- that is, the clips or the pins. As the basis for this adjustment is the position of the web, the adjustment must be initiated by the web. Ordi- 40 narily, a detector or feeler is maintained in contact with the edge of the web, and is given a deflection when the web does not run regularly, thereby actuating a pneumatic or electrically operated, intermediate arrangement for displacing- 45 the walls of the entry section.

However, there is a series of materials which i are not qualified to exert suflicient pressure to move a feeler in the manner stated. To bring such materials correctly onto the chains is the 50 purpose of this invention. For this purpose, it is proposed to employ an electric motor for adjusting each chain wall, the current to each motorfor the control ofthe web is known perse, and is not the object of this invention. The invention is designed, in stretching and drying machines, to effect theadjustment of the intake chain walls, and is limited to this field of use. 5

One of the objects of the invention is to provide a setting device which is operated without mechanically reacting on the edge of the web, and which for this reason may be used in connection with loose and crimped or crinkled webs such as crape, which are entered into the machine without longitudinal tension. With this object in view my invention consists in providing a pair of photo-electric devices at either edge of the web for controlling the setting. mechanism, the said photo-electric devices each comprising a source of light adapted to direct a pencil of light rays onto a photo-electric or light sensitive cell controlling the setting device, one of the said photo-electric devices being normally located in position for throwing the pencil of light laterally of the edge of the web, and the other one being positioned so that the said pencil of rays is normally intersected by the edge of the web.

Another object of the invention isv to provide a photo-electrically controlled setting device which can be operated in connection with thin and translucent webs, and with this object in view my invention consists in constructing the sources of light and the photo-electric cells so that the pencils of light pass through slits made longitudinally of the movement of the web or fabric in a table supporting the web, so that the light raysare distributed on a large surface, and the light impinging on the web is weak so that it does not act on the photo-electric cell.

Another object of: the improvements is to provide a setting device in which the photo-electric controlling portion may be adapted to different velocities of the web, and also to webs in which the edges are not straight, and with this object in view the invention consists in mounting the photo-electric devices of each pair so that they may be shifted relatively to each other andto the edge of the web transversely of the direction of the movement of the web. I

By providing pairs of-photo-electric devices one pair at each edge of the web and having the edge of the web moving between the photo-electric devices of each pair, in connection with the means for, setting the photo-electric'devices relatively to each other in transverse direction transverse, oscillating movement of the side walls of the entry section is prevented, and the saidside walls remain at rest whenever they have set the edge of the web into normal position.

For the purpose of explaining the invention an example embodying the same has been shown in the accompanying drawings in which the same reference characters have been used in all the views to indicate corresponding parts. In said drawings,

Fig. 1 is a diagrammatical elevation partly in section showing the entry section of the machine,

Fig. 2 is a detail elevation viewed longitudinally of the web and showing one of the photo-electric devices, I

Fig. 3 is an elevation viewed from the left in Fig. 2 and showing a pair iof photo-electric devices located at one side of the web.

Fig. 3a is a diagrammatic viewof a portion of the mechanism of Figs. 2 and 3,

Fig. 4 is a plan view of Fig. 3,

Fig. 4a is an enlarged plan view ofa portion of the mechanism of Fig. 4.

Fig. 5 is a view similar to Fig. 1. but showing the means for moving the chain walls in response to the impulses of the detectors,

Fig. 6 is a plan 'view of the mechanism illustrated in Fig. 5.

- In the construction shown in Fig. 1 the entry section of the machine comprises a pillar h on which chain walls a, electro-motors k, mechanism including gear wheels 1 and m and screwthreadd spindles i for setting the chain walls in transverse direction, needle chains j and their chain wheels 1", guide rollers b and c for the web a and photo-electric devices are mounted. By means of the screw-threaded spindles i the walls 9' are angularly set transversely of the direction of the movement of the web a according as the said spindles i are turned from the motors k clockwise or anti-clockwise. As is known in the art, the web a is trained onthe rollers b and c, and is passed therefrom on the needle chains f. The controlling device comprises two pairs of electric cells n and 0 one pair for each edge of the web. Above each photo-electric cell 11 and 0 there is a projector s, 1. adapted to throw a pencil of light d, e onto the cells n, o, and the projectors are connected by leads v with a transformer v. The current generated in the photoelectric cells n and o is passed to amplifiers p and r and relays (not shown) which control the current supplied to the motors k.

The mechanism by which transverse movement of the walls a is carried out is illustrated in Figs. 5 and 6.

Between the walls of the pillar It ,runs a U- shaped support It the upper part of which serves as a path for the carriages a, one of which is associated with each wall a. Each carriage g carries a roller 1 for the chain f. The chains I are provided with pins which engage the goods in the'introduction field, that is to say, when the goods or web come from the roller c to pass over the roller f Each carriage a is connected with a chain wall a and is movable under the influence of the threaded spindle i. It is apparent from Fig. 6 that the two spindle parts (left and right) have oppositely directed screw threads.

Outside of-the pillar h, at the end of each spindle part, there is provided a gear m which meshes with the pinion l of the motor 10. On both sides of the goods or web photoelectric cells '0 and n are provided below the web, and above them are the projectors s and t, which are energized from a transformer 12. Fig. 6 shows the normal position of the goods with respect to the slots :1: and w on both sides of the web.

The construction of the photo-electric controlling devices is shown'in detail in Figs. 2 to 4. As shown in the said figures, and more particularly in Figs. 3 and 4, a web a is. passed with its edge across a pair of tables 1 and 1 located one beside the other, and the said tables are formed each with a slot w, :1: located longitudinally of the edge of the web and at opposite sides thereof, the edge of the web, which is moved in the direction of the arrows X, Y shown in Figs. 3 and 4, normally passing between the said slots 20 and :c and the photo-electric devices n, s and o, t. Thus, in the normal position of the web and its edge the slot w of the tablezi is covered by the web, while the slot :1: permits the passage of the pencil of light. When the edge of the web is shifted into the position indicated in Fig. 4 by the character a also the slot w is uncovered, and the pencil of light from the source of light s impinges upon the photo-electric cell n. Now the electro-motor k is started, and the.

chain wall a is shifted towards the middle of the web until the slot w is again covered by the web. When on the other hand the edge of the web is shifted into the position 11 also the slot .1:

is covered, and now the photo-electric cell 0 is influenced so that the electro-motor k and the spindle 1 shift the entry wall a outwardly until the slot at is again uncovered.

The tables 1 and 1 formed with the slots 10, z are adapted to be shifted relatively to each other transversely of the direction of the movement of the web for varying the setting movement.

For thus shifting-the tables the following mechanism is provided: The table 7' carries an arm q formed with a bracket q, and in the said bracket a screw z is located. The screw-threaded part 2 engages in an internally screw-threaded lug 7' fixed to or made integral with the table 9'". Thus, when the screw z is turned clockwise or anticlockwise the tables i and 7" are shifted relatively to each. other for varying the position of the slots 10, a: relatively to the edge of the web a. On each table i and i a bracket 11 and u is mounted and each of the said brackets carries a photoelectric device 11, s and o, t respectively. The tables 1', i are slidably mounted on the machine, the said supporting means being shown diagrammatically at 1!.

Referring to Figs. 3a and 4a, the brackets u and u. are slidably connected by a dovetail 1/, 1/ The bracket u is provided with an arm or in which is journalled a spindle z the latter being retained against longitudinal movement relative to the bracket u, by means of a collar 11 secured by a pin q. The spindle z is provided with a hand wheel z, and has threaded engagement with the bracket u as at 1 It isthus apparent that the brackets u u and tables 9' 1' may be adjusted relative to each other by turning the hand wheel 2.

The object of the construction of the tables 7' and 7' which are shiftable relatively to each other is the following: As is known in the art the side walls 9 are set by means of the spindle i, the motor k and a gearing comprising gear wheels I and m intermediate the motor and the spindle. When these parts have been brought into motion by the photo-electric controlling device they tend to continuetheir movement by inertia, and there'- fore when the web has been brought into the proper position the said parts tend slightly to continue their movement, and therefore the chain wall is moved beyond the desired position when the distancebetween the slots 11; and :c is too small.

vice is reversed, and the ele'ctro-motor and the spindle i are thereafter moved in the opposite direction. For this reason the slots w, a: and the photo-electric controlling devices are set relativeiy to each other and transversely of the direction of. the movement of the web so that such oscillating movement is prevented. For this purpose the slots are removed from each other more or less. Thus the chain walls come to rest before the controlling devices are reversed, and they ing said chains, mechanism for shifting said controlling devices or each pair being located,

Therefore, when the edge has thus been moved too far the photo-electric controllingderespectively, at opposite sides of the respective edge of the web, and a table in the light path oi each said photo-electric controlling device, said tables being formed with slots extending longitudinally of the direction of movement of the web for the passage of light rays therethrough.

2. A setting device for theentry section of tensioning or tentering and drying machines-for webs, comprising chains on which the web is moved in a longitudinal direction, walls for guiding said chains, mechanism for shifting saidwalls transversely of the direction of movement of the web, a pair of photo-electric controlling devices at each edge of the web for controlling the movement of said mechanism, the photoelectric controlling devices of each pair being located, respectively, at opposite sides of the respective edge of the web, and means for shitting the photo-electric controlling devices of each pair relatively'to each other'transversely of the direction of movement of the web.

3. A device according to claim 2, comprising a member supporting each said photo-electric controlling device and its associated table, and threaded means connecting the said supporting members of each pair for transversely shifting the same relatively to each other. i

FRITZ TANDEL. 

